Here are two great articles on him and his ability to be versatile.
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Tomlin believes Morris has separated himself because of his attitude about learning. “He has redeveloped himself as an offensive coach,” Tomlin says. “Over the course of his career he’s displayed the ability to learn in great detail the 22-man perspective on the game… Everybody can’t switch hit, and he does it very fluently.”
Once Morris started coaching Julio Jones and company, he coached them like they had never been coached, teaching them from the standpoint of how a defensive player or coach would try to contain them.https://theathletic.com/2001776/2020/10/13/falcons-raheem-morris-coach-perception-is-everything/
Atlanta hired him as a WR coach after a career of being a DB coach due to this ability to learn and teach. And apparently, Julio Jones credits him with teaching him new things.